One theory doing the rounds is that Lotus' E21 is kind to the otherwise heavily-degrading tires this year because Pirelli's test car is the 2010-spec R30 -- which was designed by Enstone based Lotus' former incarnation, Renault.

"We have certainly done everything to avoid any team getting any advantage from our test data," Pirelli's Paul Hembery is quoted by German magazine Sport Bild.

He confirmed reports that rival teams rejected a proposal to share the burden of providing Pirelli with a test car.

"We even proposed that they alternate with each other to test our tires, but none of our proposals proved popular," said Briton Hembery.

"So they can't start complaining now."

Hembery also rejected a wild theory that Ferrari obtained an advantage through the shared nationality of its lead driver, Fernando Alonso, and main Pirelli tester Jaime Alguersuari.

He smiled: "Someone told me actually that Jaime and Fernando don't even talk.

"Anyway, how could a comment be converted into a design?" he wondered. "That's hard to accomplish.

"And even if you could get something from it, it would be pretty minimal."

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